Anti-combustion Al-Li-W alloy

Abstract

The invention discloses an Al-Li-W aluminum lithium alloy and a machining technology thereof, wherein the Al-Li-W aluminum lithium alloy has combustion resisting performance when being smelted at thetemperature ranging from 700 DEG C to 800 DEG C. The alloy comprises chemical components including, by weight percent, 2.0 wt.%-8.0 wt.% of Li, 1.0 wt.%-3.0 wt.% of W, 2.0 wt.%-4.0 wt.% of Ca, 1.0 wt.%-5.0 wt.% of Sr, 0.2 wt.%-0.3 wt.% of Eu, 0.1 wt.%-0.2 wt.% of Ce, 0.2 wt.%-0.4 wt.% of Ho, 1.2 wt.%-2.8 wt.% of B and the balance Al. Through the preferable alloying method, the defect of the alloyelement usage amount can be greatly reduced, a very good flame retarding effect can be achieved as well, the content of flame retarding elements is obviously reduced, and meanwhile the alloy combustion point is greatly increased. Obvious combustion is avoided when heat preservation and standing are conducted for 5 h at the atmospheric environment at the temperature ranging from 700 DEG C to 800 DEG C. The material has the mechanical performance of a traditional aluminum lithium alloy, the yield strength ranges from 400 MPa to 650 MPa, the tensile strength ranges from 500 MPa to 750 MPa, and ductility ranges from 4% to 15%. The material has the high thermal conductivity performance not achieved in the traditional aluminum lithium alloy, the thermal conductivity coefficient ranges from 120 W / m.K to 140 W / m.K, and the thermal conductivity coefficient of the traditional aluminum lithium alloy is about 85 W / m.K.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Lithium is the lightest metal element in the world. When lithium is added to aluminum, an aluminum-lithium alloy is formed. Lithium can both reduce the density of aluminum and increase the modulus of elasticity. Generally speaking, for every 1wt.% lithium added to aluminum metal, the density of aluminum alloy will decrease by about 3%, while its modulus of elasticity will increase by about 6%, making it a strong competitive product for composite materials. Aluminum-lithium alloys are mainly developed for the weight reduction of aircraft and aerospace equipment, so they are also mainly used in the aerospace field, nuclear reactor materials, tank armor-piercing bombs, torpedoes and other weapon structural parts. In addition, it is also fully used in the fields of automobiles and robots. Aluminum-lithium alloys are mainly us...

AI Technical Summary

Problems solved by technology

However, as a structural material, it is far from enough to meet the requirements of only having combustion resistance during smelting. More importantly, the final aluminum-lithium alloy product must also have satisfactory mechanical strength, at least reaching the level commonly used. Mechanical properties of Al-Li alloys